Add a system API to make a package become visible to other package

Expose a system API PackageManager#makeUidVisible for
mainline module to make a package become visible to the caller.

Bug: 222205552
Test: atest AppEnumerationTests
Test: atest PermissionPolicyTest
Ignore-AOSP-First: (for packages/Shell/AndroidManifest.xml) Permission
Change-Id: I6cf322ddfea09a8a4c0c442a6789af4e79d294d7
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index dae63a8..8c922ca 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -668,6 +668,9 @@
     <!-- Permission required for CTS test - CtsTelephonyTestCases -->
     <uses-permission android:name="android.permission.BIND_TELECOM_CONNECTION_SERVICE" />
 
+    <!-- Permission required for CTS test - CtsAppEnumerationTestCases -->
+    <uses-permission android:name="android.permission.MAKE_UID_VISIBLE" />
+
     <application android:label="@string/app_label"
                 android:theme="@android:style/Theme.DeviceDefault.DayNight"
                 android:defaultToDeviceProtectedStorage="true"